using System.Text.Json;
using DeepDrftModels.DTOs;
using DeepDrftModels.Enums;
using Microsoft.AspNetCore.Components;

namespace DeepDrftPublic.Client.Services;

/// <summary>
/// Production <see cref="IPlayEventSink"/> (Phase 16 §2.2): serializes the play classification and fires
/// it via <c>navigator.sendBeacon</c> to the proxied <c>api/event/play</c> route. Fire-and-forget by
/// design — <see cref="IPlayEventSink.EmitPlay"/> is synchronous (it is called from the player's close
/// path and the unload handler, neither of which can await), so the beacon is dispatched without
/// awaiting and its failure is irrelevant. No <c>anonId</c> is sent in wave 16.1.
/// </summary>
public sealed class BeaconPlayEventSink : IPlayEventSink
{
    private readonly BeaconInterop _beacon;
    private readonly string _playUrl;

    public BeaconPlayEventSink(BeaconInterop beacon, NavigationManager navigation)
    {
        _beacon = beacon;
        // The WASM client posts to its own host, which proxies to DeepDrftAPI. BaseUri carries a
        // trailing slash; the route does not lead with one.
        _playUrl = $"{navigation.BaseUri}api/event/play";
    }

    public void EmitPlay(string trackEntryKey, PlayBucket bucket)
    {
        var json = JsonSerializer.Serialize(new PlayEventDto
        {
            TrackEntryKey = trackEntryKey,
            Bucket = bucket,
        });

        // Fire-and-forget: do not await. The beacon survives unload; the C# task may not, and we do not
        // act on the result either way.
        _ = _beacon.SendAsync(_playUrl, json);
    }
}